Siemens SINAMICS G120 Compact Operating Instructions page 14

Installing
3.4 Terminal strips on CU240E-2 Control Units
Additional options for wiring the digital inputs
Connecting P-switching contacts with an external
Connecting M-switching contacts with an external
14
power supply
power supply
If you wish to connect the potential of
an external power supply with the po-
tential of the internal inverter power
supply, then you must connect "GND"
with terminals 34and 69.
Connect terminals 69 and 34 with one
another.
CU240B-2 and CU240E-2 Control Units
Compact Operating Instructions, 04/2015, A5E35792002B AA